NR DCI configuration for uplink power transmission

Abstract

Systems and methods for transmission of full power uplink transmission in 5G networks are described. The gNB provides TPMI precoding information in DCI of a PDCCH in which the field size for precoding information and number of layers are fixed irrespective of the SRI. The gNB indicates in RRC signaling the use of codebook-based transmission for UL. If different SRS resources with different number of antenna ports are configured, the bitwidth of the SRI field is the maximum number of ports among the configured SRS resources in an SRS resource set with usage set to ‘codebook’. If the number of ports for a configured SRS resource in the set is less than the maximum number of ports, the most significant bits of the field have a value of ‘0’. The bitwidth is dependent on UE coherence capabilities and a maxrank of the UE.

What is claimed is: 
     
       1. An apparatus for a 5 th  generation NodeB (gNB), the apparatus comprising:
 processing circuitry configured to:
 determine a maximum number of antenna ports in a sounding reference signal (SRS) resource among configured SRS resources in an SRS resource set; 
 set a bitwidth of a downlink control information (DCI) field for precoding information and number of layers based on the maximum number of antenna ports by inserting bits into the DCI field if the number of antenna ports is less than the maximum number of antenna ports; and 
 encode, for transmission to a user equipment (UE), a physical downlink control channel (PDCCH) having a DCI that includes the DCI field; and 
 
 memory configured to store the DCI. 
 
     
     
       2. The apparatus of  claim 1 , wherein the processing circuitry is further configured to encode, for transmission to the UE, Radio Resource Control (RRC) signalling indicating codebook-based physical uplink shared channel (PUSCH) transmission and the SRS resources in the SRS resource set. 
     
     
       3. The apparatus of  claim 2 , wherein the processing circuitry is further configured to encode, for transmission to the UE, RRC signalling that indicates a codebook subset selected from among “fullyAndPartialAndNonCoherent”, “partialAndNonCoherent”, and “noncoherent”, the bitwidth of the DCI field for precoding information and number of layers dependent on the codebook subset. 
     
     
       4. The apparatus of  claim 2 , wherein the processing circuitry is further configured to encode, for transmission to the UE, RRC signalling that indicates a maximum rank, the bitwidth of the DCI field for preceding information and number of layers dependent on the maximum rank. 
     
     
       5. The apparatus of  claim 2 , wherein the processing circuitry is further configured to encode, for transmission to the UE, RRC signalling that indicates a list of SRS resource sets, each SRS resource set having a set of SRS resources with a number of antenna ports associated with the SRS resource set. 
     
     
       6. The apparatus of  claim 1 , wherein if the number of antenna ports for the configured SRS resources is less than the maximum number of antenna ports, the processing circuitry is further configured to insert a value of ‘0’ into a number of most significant bits of the DCI field. 
     
     
       7. The apparatus of  claim 6 , wherein the bitwidth of the DCI field is dependent on UE coherence capabilities that indicate whether the UE is able to maintain a relative phase among the antenna ports over time, the UE coherence capabilities comprising full coherence in which the UE is able to maintain the relative phase among all of the antenna ports over time, partial coherence in which the UE is able to maintain the relative phase among at least one and fewer than all of the antenna ports over time, and non-coherence in which the UE is unable to maintain the relative phase among any of the antenna ports over time. 
     
     
       8. The apparatus of  claim 6 , wherein the bitwidth of the DCI field is dependent on a maximum rank of the UE. 
     
     
       9. A non-transitory computer-readable storage medium that stores instructions for execution by one or more processors of a 5 th  generation NodeB (gNB), the instructions when executed configure the one or more processors to:
 determine a maximum number of antenna ports in a sounding reference signal (SRS) resource among configured SRS resources in an SRS resource set; 
 set a bitwidth of a downlink control information (DCI) field for precoding information and number of layers based on the maximum number of antenna ports by inserting bits into the DCI field if the number of ports is less than the maximum number of antenna ports; and 
 encode, for transmission to a user equipment (UE), a physical downlink control channel (PDCCH) having a DCI that includes the DCI field. 
 
     
     
       10. The medium of  claim 9 , wherein the instructions when executed configure the one or more processors to encode, for transmission to the UE, Radio Resource Control (RRC) signalling indicating codebook-based physical uplink shared channel (PUSCH) transmission and the SRS resources in the SRS resource set. 
     
     
       11. The medium of  claim 10 , wherein the instructions when executed configure the one or more processors to encode, for transmission to the UE, RRC signalling that indicates a codebook subset selected from among “fullyAndPartialAndNonCoherent”, “partialAndNonCoherent”, and “noncoherent”, the bitwidth of the DCI field for precoding information and number of layers dependent on the codebook subset. 
     
     
       12. The medium of  claim 10 , wherein the instructions when executed configure the one or more processors to encode, for transmission to the UE, RRC signalling that indicates a maximum rank, the bitwidth of the DCI field for precoding information and number of layers dependent on the maximum rank. 
     
     
       13. The medium of  claim 10 , wherein the instructions when executed configure the one or more processors to encode, for transmission to the UE, RRC signalling that indicates a list of SRS resource sets, each SRS resource set having a set of SRS resources with a number of Antenna ports associated with the SRS resource set. 
     
     
       14. The medium of  claim 9 , wherein the instructions when executed configure the one or more processors to, if the number of Antenna ports for the configured SRS resources is less than the maximum number of Antenna ports, insert a value of ‘0’ into a number of most significant bits of the DCI field. 
     
     
       15. The medium of  claim 14 , wherein the bitwidth of the DCI field is dependent on UE coherence capabilities that indicate whether the UE is able to maintain a relative phase among the Antenna ports over time, the UE coherence capabilities comprising full coherence in which the UE is able to maintain the relative phase among all of the Antenna ports over time, partial coherence in which the UE is able to maintain the relative phase among at least one and fewer than all of the Antenna ports over time, and non-coherence in which the UE is unable to maintain the relative phase among any of the Antenna ports over time. 
     
     
       16. The medium of  claim 14 , wherein the bitwidth of the DCI field is dependent on a maximum rank of the UE. 
     
     
       17. A non-transitory computer-readable storage medium that stores instructions for execution by one or more processors of a user equipment (UE), the instructions when executed configure the one or more processors to:
 decode, from a 5 th  generation NodeB (gNB), a physical downlink control channel (PDCCH) having a downlink control information (DCI) that includes a field for precoding information and number of layers based on a maximum number of antenna ports in a sounding reference signal (SRS) resource among configured SRS resources in an SRS resource set, the field having bits inserted into the field if the number of antenna ports is less than the maximum number of antenna ports; and 
 encode, for transmission to the gNB, a physical uplink shared channel (PUSCH) in response to the PDCCH. 
 
     
     
       18. The medium of  claim 17 , wherein the instructions when executed configure the one or more processors to decode, from the gNB, Radio Resource Control (RRC) signalling indicating codebook-based physical uplink shared channel (PUSCH) transmission and the SRS resources in the SRS resource set. 
     
     
       19. The medium of  claim 18 , wherein the instructions when executed configure the one or more processors to decode, from the gNB, RRC signalling that indicates a codebook subset selected from among “fullyAndPartialAndNonCoherent”, “partial AndNonCoherent”, and “noncoherent”, a bitwidth of the DCI field for precoding information and number of layers dependent on the codebook subset. 
     
     
       20. The medium of  claim 19 , wherein the instructions when executed configure the one or more processors to decode, from the gNB, RRC signalling that indicates a maximum rank, the bitwidth of the DCI field for precoding information and number of layers dependent on the maximum rank.